I can't comment with any certainty on fights I haven't seen but his victories over bivins, ray, maxim and Charles are certainly questionable.
It was supposedly close but Walcott did KD Ray 3 times in the fight in 3 seperate rounds. http://news.google.com/newspapers?i...4967300&dq=jersey+joe+walcott+elmer+ray&hl=en After this Walcott had supposedly punched himself out according to his manager and gave away 4-5 rounds by inacitivity. Ray didn't do a whole lot in these rounds either though. http://news.google.com/newspapers?i...3,49385&dq=jersey+joe+walcott+elmer+ray&hl=en
This is actually a report on the second fight, in which Ray won a supposedly close, debatable decision (with no KDs). IIRC, the reports I've read on the rubber match appear to indicate Walcott won clearly.